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1. |
In a stream running at 2 km/h, a motor boat goes 10 km upstream and back again to the starting point in 55 min. The speed of the motorboat in still water is |
A. | 19 km/h |
B. | 20 km/h |
C. | 21 km/h |
D. | 22 km/h |
Answer» E. | |